Poly(perfluoroalkoxy)polyfluoroalkyl acrylate-type esters and their polymers



United States Patent O 3,544,537 POLY(PERFLUOROALKOXY)POLYFLUOROAL- KYL ACRYLATE-TYPE ESTERS AND THEIR POLYMERS Neal 0. Brace, Wheaton, Ill., assignor to E. I. du Pont de Nemours and Company, Wilmington, Del., a corporation of Delaware No Drawing. Filed May 31, 1968, Ser. No. 733,271 Int. Cl. C08f 3/64, 3/66 US. Cl. 260-895 5 Claims ABSTRACT OF THE DISCLOSURE Esters of the formula R O[CF(CF )CF O] CF(CF )CH O CCR CH wherein R, is perfluoroalkyl, R is hydrogen or methyl and n is an integer of 0-2. Homopolymers of the above esters; and copolymers of the above esters with at least one polymerizable vinylidene monomer free of non-vinylic fluorine, in which units derived from the ester are present in an amount of at least 25% by weight. Polymeric mixtures of a polymer defined in the preceding sentence and a polymer of at least one polymerizable vinylidene monomer free of non-vinylic fluorine, in which the mixture contains at least 3% by weight of polymer units derived from the esters of the first paragraph above. Textiles treated with the polymers and polymeric mixtures defined above.

BACKGROUND OF THE INVENTION Field of the invention This invention relates to acrylate-type esters of poly- (perflnoroalkoxy)polyfluoroalkanols, their polymers and compositions containing their polymers.

Description of the prior art Poly(perfluoroalkoxy)polyfluoroalkanols are described in US. Pat. 3,293,306 and are stated to be useful in preparing esters such as the phosphate di-esters described therein. However, carboxylate esters, especially ones derived from an unsaturated carboxylic acid, have not been prepared heretofore. It is an object of this invention to prepare such esters and to prepare polymers and polymeric compositions derived from them. These and other objects will become apparent hereinafter.

SUMMARY OF THE INVENTION This invention is directed to polymerizable ester monomers of the structural formula wherein R; is perfluoroalkyl of 1 through 6 carbon atoms, R is hydrogen or methyl, and n is an integer of zero through two.

The invention is also directed to polymers of the monomers defined above, including homopolymers and copolymers with vinylidene monomers free of non-vinylic fluorine. These polymers can be defined as polymers containing from about 25% to 100% by weight units derived from the monomers of this invention and from 0% to about 75% by weight units derived from at least one vinylidene monomer free of non-vinylic fluorine.

The invention is further directed to polymeric mixtures containing a polymer described in the preceding paragraph and a polymer of at least one vinylidene monomer free of non-vinylic fluorine, in which the mixture contains at least 3% by weight units derived from the monomers of this invention.

The invention also includes the application of the poly- 3,544,537 Patented Dec. 1, 1970 "ice mers and the polymeric mixtures of this invention to textiles.

DESCRIPTION OF THE INVENTION The ester monomers of this invention are ultimately derived from hexafluoropropylene by the following steps: oxidation of hexafluoropropylene to hexafluoropropylene oxide, polymerization of the oxide to acid fluorides of the structure R O [CF(CF CF 0 CF (CF COF reduction of these acid fluorides to the alcohols R O[CF (CF CF 0] CF(CF CH OH and finally esterification of the alcohols to form the esters R O [CF (CF, CF 0] CF (CF CH O CCR CH may be carried out in the presence of activated charcoal or certain inorganic fluorides such as cesium fluoride. If the epoxide alone is used, the products have R; as CF CF CF Warnell, 3,125,599; Moore & Milian & Eleuterio, US. Patent 3,250,808; Moore, British Specification 1,033,574 or French Patent 1,359,426. The epoXides may also be polymerized in the presence of carbonyl fluoride to give the products CF 0 [CF (CF CE 0] CF (CF COF (US. 3,250,808, and French Pat. 1,362,548) or other perfluoroacid fluorides such as R COF to give RfCF2.0[CF(CF3) CF O],,CF(CF COP (US. 3,250,808, French 1,362,548). Polymerization of the epoxide in the presence of perfiuoroketones gives the products or in the presence of perfluorocyclic ketones to give the products wherein R, is a 3-8 carbon perfluoroalkylene (Selman, Canadian Patent 707,363). The epoxides may also be polymerized in the presence of alkali metal salts of perfluoro-tertiary-alcohols, e.g., (R COCs, to give the products (R CO.[CF(CF )CF O] CF (CF )COF (Temple, U.S.S.N. 504,168, filed Oct. 23, 1965) Thus, the acid fluorides R O [CF (CF CF 0 CF (C1 COF are readily available where R is a perfluoroalkyl group, either straight or branched chain, or a cycloperfluoroalkyl group, of one to six carbons, and consequently R in the monomers and polymers of this invention can have the same structures.

The acid fluorides are readily reduced to the corresponding alcohols R O [CF (Cl- CF CF (CF )CH OH for example with sodium brohydride or with hydrogen and catalysts as described in LeBleu & Fassnacht US. Patent 3,293,306.

The alcohols are readily converted to the corresponding acrylic or methacrylic acid esters of this invention by a number of means, for example, direct esterification of the acid with the alcohol in the presence of acids such as sulfuric acid; reaction of the alcohols with acrylic or methacrylic acid chlorides in the presence of tertiary amines, or by transesterification with lower alkyl esters, for example methyl or ethyl acrylate or methacrylate, in the presence of mineral acids such as sulfuric acid or tetraalkyl titanates such as tetraisopropyl titanate.

Although productscould be manufactured containing an R; group of more than six carbons, this would require initial polymerization of the hexafluoropropylene oxide in the presence of perfluoroacid fluorides R COF, perfluoroketones (RQ CO or perfluoro-tertiary-alcohol salts (R COCs containing more than six carbons. Such compounds are known but are relatively more expensive and a larger R; group in the esters R O [OF (CF CF 0] CF (CF CH O CCR=CH gives little useful benefit which counteracts the added cost. The preferred esters are those derived from the acid fluoride products obtained by polymerizing hexafiuoropropylene oxide without added perfluoroacid fluoride, ketone or tertiary alcohol and thus have the structure The value of n in the esters -R;O [CF(CF CF 0 CF CF CH O CCR=CH may vary from zero to two. Esters can be prepared in which the value of n exceedstwo by the methods outlined earlier, but the polymers of such esters do not have the utility as oil and water repellents for textiles that the polymers of this invention have.

The methacrylic acid esters are the preferred esters of this invention, i.e., those preferred having the structure where y is zero or one. Correspondingly, preferred polymers of this invention are those containing recurring units derived from said methacrylic acid esters.

The monomers are readily polymerized or copolymerized by free radical initiated systems. Although bulk polymerization may be used, emulsion and solution polymerizations are preferred. The homopolymers of are useful oil and water repellents when properly applied; however, it is preferred to use copolymers of R o [CF CF CF 0] CF (Cl- CH O CCR=CH with vinylidene monomers as the basis for oil and Water repellents. Such vinylidene monomers contain the polymerizable group, CH =C and are free of non-vinylic fluorine, i.e., do not have flourine attached to the nonvinylic moiety of the vinylidene monomer. These vinylidene monomers include alkyl acrylates and methacrylates, acrylo and methacrylonitriles, vinyl esters of aliphatic acids, styrene and alkyl substituted styrenes, vinyl halides, vinylidene halides, allyl type esters, vinyl alkyl ketones, vinyl alkyl ethers and conjugated 1,3-dienes. Representative examples include: methyl acrylate and methacrylate, propyl acrylate and methacrylate, butyl acrylate and methacrylate, isoamyl acrylate and methacrylate, 2-ethy1- hexyl acrylate and methacrylate, octyl acrylate and methacrylate, octadecyl acrylate and methacrylate, lauryl acrylate and methcrylate, cetyl acrylate and methacrylate, stearyl acrylate and methacrylate, vinyl acetate, vinyl propionate, vinyl caprylate, vinyl laurate and vinyl stearate, styrene, a-methylstyrene, p-methylstyrene, vinyl fluoride, vinyl chloride, vinyl bromide, vinylidene fluoride, vinylidene chloride, allyl heptanoate, allyl acetate, allyl caprylate, allyl caproate, vinyl methyl ketone, vinyl ethyl ketone, 1,3-butadiene, 2-chloro-l,3-butadiene, 2,3-dichloro-l,3-butadiene, isoprene, vinyl methyl ether, vinyl butyl ether, vinyl ethyl ether, vinyl decyl ether, and vinyl stearyl ether.

The preferred vinylidene monomers are the alkyl methacrylates. It is also usually preferable, depending on the end use intended as discussed below, to include a small amount of one or more of N-methylolacrylamide or N- methylol methacrylamide; an aminoalkyl acrylate or aminoalkyl methacrylate ester; hydroxyethyl acrylate or hydroxyethyl methacrylate; or glycidyl acrylate or glycidyl methacrylate in the copolymer to increase durability to laundering or dry-cleaning. Usually from about 0.2% to 5% by weight of the total weight of the copolymer will be due to the monomers of the preceding sentence. The preferred alkyl methacrylates are n-butyl, n-amyl, n-hexyl, isoamyl,2-ethylhexyl, n-heptyl, n-octyl, lauryl and stearyl methacrylates, depending on the end use intended. Styrene, 2,3-dichloro-l,3-butadiene and alkyl acrylates are also quite useful copolymer components but generally less preferable than the methacrylates. The copolymers should contain at least 25% by weight of the monomers to be useful as oil and water repellents for textiles. Any amount greater than 25% up to may be used.

When it is desired to apply the copolymers of this invention from aqueous media, it is most convenient to prepare the copolymers by the well known aqueous emulsion techniques. The process is carried out in a reaction vessel fitted with a stirrer and external means of either heating or cooling the charge. The monomer or monomers to be polymerized together is emulsified in a water solution of a surface active agent to a given emulsion concentration of from about 5% to about 50%. Usually the temperature is raised to between 40 C. and 70 C. to effect polymerization in the presence of an added catalyst. A suitable catalyst may be any one of the commonly known agents for initiating the polymerization of an ethylenically unsaturated compound: These include:

2,2'-azodiisobutyramidine dihydrochloride, 2,2'-azodiisobutyronitrile,

2,2'-azobis (2,4-dimethyl-4-methoxyvaleronitrile) sodium peroxide,

barium peroxide,

hydrogen peroxide,

ammonium persulfate,

potassium persulfate,

and the like. The concentration of the catalyst for the polymerization usually is between 0.1% and 2% based on the weight of the monomers. The surface active agents employed to stabilize the emulsion during its makeup and polymerization are anionic, cationic, or non-ionic emulsifying agents, but preferably they are the cationic or anionic type. Representative anionic emulsifying agents are alkyl (C to C )-sodium sulfate, sodium alkyl (C to C1 )-benzenesulfonate, sodium alkylnaphthalenesulfonate, the sodium salt of sulfated alkenyl (C to C acetate, sodium oleate, the sodium salt of sulfated methyl oleate, ammonium w-H-polyfluoroalkanoate (C to C and ammonium perfluoroalkanoate. The cationic agents that may be employed include dodecyltrimethylammonium acetate, trimethyltetradecylammonium chloride, hexadecyltrimethylammonium bromide, trimethyloctadecylammonium chloride, (dodecylmethylbenzyl)-trimethylammonium chloride, benzyldodecyldimethylammonium chloride, N-[2-(diethylamino)ethyl] oleamide hydrochloride, dimethyltetradecylammonium acetate, dimethylhexadecylammonium acetate and dimethyloctadecylammonium acetate. Non-ionic surface active agents that may be employed include condensation products of ethylene oxide with hexylphenol, isooctylphenol, hexadecanol, oleic acid, alkane (C C )-thiol, alkyl (C -C amines and the like. In addition, small amounts of chain transfer agents may be present during the polymerization, such as, for example, an alkanethiol of four to 12 carbon atoms.

A particularly preferred method for aqueous emulsion polymerization is that described in Netherlands published application 6,510,472, published Feb. 12, 1966, wherein the water insoluble monomers are prehomogenized in water prior to addition of any water soluble monomers and initiators. Water soluble initiators are used and chain transfer agents are usually included.

If an organic solvent can be tolerated in the aqueous system, the process of Sherman et al., U .8. Pat. 3,062,765, is also useful.

When it is desired to apply the copolymers of this invention from an organic solvent solution, it is preferred that the copolymers be prepared by solution polymerization techniques, which are well known in the art. The chosen monomers and the initiators are dissolved in the solvent in a reaction vessel fitted with a stirrer and means of either heating or cooling the charge. Concentrations of the monomer may vary from -50%. The reaction temperature is raised to between 40-100 C. to effect polymerization. When polymerization is complete, the resulting solution is usually used directly to prepare solutions. Useful initiators for solution polymerization are peroxide and azo compounds which are soluble in the organic solvent. These include an acyl peroxide such as benzoyl peroxide and lauroyl peroxide, organic peresters such as tertiary butyl perbenzoate, dialkyl peroxides such as ditertiarybutyl peroxide and organic azo compounds such as azobis(isobutyronitrile) and azobis (2,4- dimethylvaleronitrile) and known related compounds. The concentration of initiators will usually range from about 0.1% to about 2% based on the weight of monomers. If the solvent itself or other conditions are insufficient to properly control molecular Weight, small amounts of chain transfer agents such as alkanethiols with four to 12 carbons may be added. The preferred solvents for solution polymerization are tetrachloroethylene, trichlorotrifiuoroethane and tetrachlorodifluoroethane.

Although the homo or copolymers of the monomers 12,0 [CF (CF CF 0] CF (CF CH O CCR CH are useful alone as oil and water repellents when suitably applied, it has been found that more efficient use of these copolymers results if they are mixed with vinylidene polymers. These vinylidene polymers are free of non-vinylic fluorine. Such mixtures of polymers must contain at least 3 by weight of units derived from the monomer R O [CF (CF CF 0] ,CF (CF CH O CCR=CH Any amount greater than 3% may be used, including, of course, the instance where the homopolymers of R o [CF (CF )CF O ,CF (CF CH O CCR=CH are used alone, but use of less than 3% results in unsatisfactory oil and water repellencies. The preferred amount varies with the particular end use.

6 The vinylidene polymers are prepared by any useful means. The emulsion and solution methods described hereinbefore are useful in most cases for preparation of the vinylidene polymers. The same vinylidene monomers which were described earlier as useful for preparing copolymers of R O [CF( CF CF 0 -CF (CF CH O CCR=CH are, in addition, certain useful vinyldidene polymers, particularly in certain solvent application systems as The vinylidene polymers may be homopolymers or copolymers of two or several vinylidene monomers. There are, in addition, certain useful vinylidene polymers, particularly in certain solvent application systems as described below, which are prepared from monomers other than those described earlier.

As was indicated earlier, the compositions of this invention may be applied from aqueous emulsion systems or from organic solvent systems. As these compositions vary somewhat, particularly in the preferred polymers of R O [CF (CF CF 0 CF( CFQCH O CCR CH the preferred vinylidene polymers, the methods of application, additional useful adjuvants and useful substrates, they are discussed separately hereinbelow.

Application from aqueous emulsion systems has the greatest versatility and broadest usefulness of the several available systems. In such systems, an emulsion of the polymer of R 0 [CF (CF CF 0 CF CF CH O CCR=CH the vinylidene polymer and any desired adjuvants are prepared most readily by mixing emulsions of the two types of polymers and adding the adjuvants as desired.

In aqueous emulsion systems, it is preferred to use copolymers of R o [CF CF CF 0] CF CF CH O CCR CH and the vinylidene monomer containing larger amounts of the fiuorinated ester monomers, 40% or greater. To increase durability of the resulting oiland water-repellent copolymers, from 0.2% to 5% of N-methylolacrylamide or methacrylamide, an aminoalkyl acrylate or methacrylate ester, or 2-hydroxyethyl acrylate or methacrylate, or mixtures of these are added. Most preferably, from 1% to 5% of units derived from the vinylidene monomer, preferably alkyl esters of acrylic or methacrylic acid are present. Some preferred examples are the copolymers containing 97.7%

C F O [CF (CF CF 0] ,,CF( CF CH O CC CH )=CH where n is 0 or 1, 1.8% butyl acrylate and 0.5% N-methylolacrylamide; and 74.6%

C3F1O [CF CF 3 CF 0 CF( CF CH O CC CH CH Where n is 0 or 1, 24.9% 2-ethylhexyl methacrylate, 0.25% Z-hydroxyethyl methacrylate and 0.25% N-methylolacrylamide. These are illustrative of course and can be varied widely.

Emulsions of any of the vinylidene polymers previously indicated may be mixed with the above copolymers for application. The particularly preferred vinylidene polymers for use in aqueous emulsion systems are those of alkyl acrylates or methacrylates, particularly the latter. As with the copolymers above, it is preferred to have a small amount, e.g., 0.1% to 5%, of N-methylolacrylamide or methacrylamide, an aminoalkyl acrylate or methacrylate ester or 2-hydroxyethyl acrylate or methacrylate, or mixtures thereof, in these vinylidene polymers. A preferred vinylidene polymer is the polymer of 2-ethylhexyl methacrylate containing 0.1% N-methylolacrylamide. This is again illustrative and can be varied widely.

Occasionally, it is desirable that the vinylidene polymer be crosslinked. This is readily accomplished by including therein from 0.05% to 10% by weight of nonconjugated divinyl compound. Such crosslinked vinylidene polymers are particularly useful when the composi 7 tions of this invention are being co-applied with certain melamineformaldehyde condensates such as those described in U.S. Pat. 2,783,231, and the running temperatures exceed 120 F. Under such conditions, a gummy mass may form on pad-rolls and the like unless the vinylidene polymer is crosslinked.

The uonconjugated divinyl compounds must contain two polymerizable vinyl groups. Each vinyl group must polymerize independently of the other; that is, the two vinyl groups cannot polymerize together as a unit such as occurs in conjugated divinyl compounds such as 1,3- butadiene or substituted 1,3-butadienes. These divinyl compounds may be acrylic type esters of alkanediols, divinyl esters of alkanedioic acids, vinyl esters of acrylic type acids, allylic esters of acrylic type acids, divinyl substituted aromatic compounds in similar related compounds. Representative examples include ethylene glycol diacrylate and dimethacrylate, 1,3-propylene glycol diacrylate and dimethacrylate, tetramethylene glycol diaccrylate and dimethacrylate, pentamethylene glycol diacrylate and dimethacrylate, hexamethylene glycol diacrylate and dimethylacrylate, decamethylene glycol diacrylate and dimethylacrylate, diethylene glycol diacrylate and dimethacrylate, divinyl succinate, divinyl adipate, divinyl suberate, divinyl benzene, divinyl toluene, vinyl acrylate and methacrylate, vinyl a-chloroacrylate and allyl acrylate and methacrylate.

The aqueous emulsion may contain only the copolymer of R [CF (CF CF 0 1 CF( CF CH O CCR=CH and the vinylidene polymer. Under such circumstances, the mixtures will preferably contain at least about 25% of polymerized fluorinated monomer. It is common practice in the textile industry to treat fabrics with several agents at the same time. These agents may include softeners, crease-resistance agents, wetting agents, antistatic agents, resin finishes and the like. Many of these agents tend to dilute the vinylidene polymer portion of the present polymer composition with materials which are inert as oil and water repellents. In such cases better results are obtained if higher concentrations of copolymers of R O [CF CF CF 0] CF CF 3 CH O CCR=CH composition is preferred. When other adjuvants are present, larger amounts of the copolymer give better results and indeed, the vinylidene polymer may be omitted if suflicient other additives are present. About 40% by weight polymerized monomer is preferred in such cases, particularly from a value in use viewpoint.

Suitable substrates for the application of the compositions of this invention are films, fibers, yarns, fabrics, and articles made from filaments, fibers, or yarns derived from natural, modified natural, or synthetic polymeric materials or from blends of these other fibrous materials and other porous materials which will absorb and transport low surface tension liquids either on their surfaces or in their interstices by capillary action. Specific representative examples are cotton, silk, wool, regenerated cellulose, nylon, fiber-forming linear polyesters, fiberforming polyacrylonitrile, cellulose nitrate, cellulose acetate, ethyl cellulose, paper, fiber glass, wood pressed or otherwise hardened wood composites, metals unglazed porcelain, porous concrete and the like. Dyed and undyed cotton sateen, poplin, broadcloth, jean cloth, gabardine and the like are especially adaptable for treatment with the compositions of this invention to provide products having a high repellency to oil and water and being relatively unaffected by the action of heat, air and light. Materials rendered oil and water repellent by the invention polymer compositions retain a portion of the original repclleut when laundered and dry cleaned.

The compositions are applied from aqueous dispersion by brushing, dipping, spraying, padding, roll-coating or by any combination of these methods. For example, the pprepared concentrated dispersion of polymer composition may be used as a pad bath by diluting it with water to a solids content of 0.1% to 10% by weight of the bath. The textile material, or paper if desired, is padded in this bath, and is then freed of excess liquid, usually by squeeze rolls, so that the dry pickup (weight of the dry polymer on fiber) is between about 0.1 and 10% by weight of the fiber. The fabric so treated must contain at least 0.3% by weight of R O [CF CF 3 CF 0] C]? CF CH O CCR=CH in polymerized form. The treated material is then heated at C. to C. for at least about 15 seconds to impart maximum durability of the agent on the material. The resulting textile material or paper will be found to be resistant to water and oil, and the textile material will retain its resistance to such agents even after many launderings and dry cleanings.

When the copolymers are to be applied from solution, it is preferable to include 0.2 to 5% of glycidyl acrylate or methacrylate in the copolymer, rather than the methylol-arnides, aminoalkyl acrylics or hydroxyalkyl acrylics described hereinbefore for use with polymers applied from aqueous emulsion. In addition, certain vinylidene polymers not described earlier are useful in solvent systems. These include chlorosulfonated hydrocarbon polymers such as chlorosulfonated polyethylene (U.S. Pat. 2,586,- 363), certain polyurethanes as described in U.S. Pat. 2,929,800 and certain vinylidene polymers containing acid halide groups such as the terpolymer of ethylene, vinyl acetate and methacrylyl chloride, for example, in the ratio 74/22/4. Solutions, generally in the solvents previously described for solution polymerization, are applied to textiles, usually containing 0.1-10% by weight total solids, by spraying or dipping. The solvent is then evaporated and the textile is cured at 165-195 C. for at least 15 seconds. Solution applications are useful for fabrics which cannot tolerate water.

EXAMPLES Starting materials were prepared by art methods, that is n-C F OCF(CF )CH OH and n-C F- OCF(CF CF OCF(CF CH OH were prepared from hexafluoropropylene oxide using the procedure by Moore et al., U.S. 3,250,808, Example 4, to obtain the acid fluoride, and the acid fluorides were reduced to the above alcohols using sodium borohydride,

as taught by LeBleu and Fassnacht, U.S. 3,293,306.

Using the same procedures,

n-C F O [CF(CF CF 0] CF(CF CH OH was prepared for comparison purposes.

EXAMPLE 1 (A) Preparation of To a solution of 172.7 parts n-C F OCF(CF CF OCF (0P CH OH in 300 parts anhydrous ethylene glycol dimethyl ether was added under anhydrous conditions a solution of 35 parts methacrylyl chloride and 33.8 parts triethylamine in an equal volume of ethylene glycol dimethyl ether over a period of about two hours. While maintaining the reaction mass at 0 C. After stirring for six hours at 0 C. and eight hours at ambient temperature, the reaction mass was separated from precipitated triethylamine hydrochloride by filtration and the solvent was evaporated from the filtrate at reduced pressure. The residue was distilled at reduced pressure, using tetramethyldiphenylene quinone inhibitor, giving n-C F OCF(CF )CF OCF(CF )CH O CC(CH )=CH 165.1 parts, 95.2% yield, B.P. 31-33 C. at 0.5 mm. pressure.

Analysis.-Calcd for C13F17O4H7 (percent): C, 28.4; H, 1.3; F, 58.6. Found (percent): C, 26.6; H, 1.1; F, 58.6.

(B) Preparation of n-C F OCF(CF CF O-CF (CF CH O CCH=CH If the procedure of Part A is repeated, replacing the 35 parts methacrylyl chloride with 30.3 parts acrylylchloride, the corresponding acrylate ester (D) Preparation of n-C F OCF (CF CH O CCH=CH If the procedure of Part A is repeated using 30.3 parts acrylyl chloride and 120.6 parts 10 When a solution of 18.1 parts acrylyl chloride and 20.3 parts triethylamine in an equal volume of ethylene glycol dimethyl ether was added to a solution of 138.3 parts n-C F O [CF(CF CF 0] CF(CF CH OH in 175 parts ethylene glycol dimethyl ether, 77.0 parts (52.4%) of n-C3F7O [CF (CF CF 0 CF(CF CH O CCH=CH B.P. 72-75 C. at 0.4 mm., was obtained.

Analysis.-Calcd for C H F O (percent): C, 24.9; H, 0.58; F, 63.4. Found (percent): C, 24.9; H, 0.6; F, 63.4.

EXAMPLE 2 Polymerization general procedure The following recipe was used:

Water ml. Water 15.6 ml. Dimethyloctadecylamine acetate 4.6 ml.

in water) Acetic acid 0.76 ml. Monomer of this invention 20.0 grams 10% dodecylmercaptan in n-butyl acrylate 0.08 ml. n-Butyl acrylate 0.37 ml. N-methylolacrylamide aqueous) 0.15 ml.

Azobisisobutyramidine dihydrochloride 0.008 g.

The mixture of water, amine acetate and acetic acid was added to the water and stirred until dissolved. The monomer was then added and stirred until dispersed. The mercaptan, butyl acrylate and acrylamide were added and the final mixture heated under nitrogen to about 70 C. The azo compound was then added and polymerization was continued for about four hours at 70 C. The results n-C F OCF(CF )CH OH are shown below in Table I.

TABLE I Percent Inherent Monomer solids viscosity (I) n-C3F1OCF(CF3)CFzOCF(CF3)CH2OC0(OH3)CH2 22.5 0.734at 0.1%. (II) n-O3F1OCF(CF3)CH2OzCC(CH;)=CH2 Inherent viscosity=lln n) where C is polymer concentration in g./100 ml. solution, In is the natural logarith,

C o] [71.] is the viscosity of the solution and n the viscosity of the solvent, C and n being at the indicated concentration in 1,1,2-trichloro-1,2,2-trifluoroethane at 30 C.

the acrylic ester n-C F OCF( CF CH O CCH=CH is obtained.

(E) Preparation of n-C F O-[CF(CF )CF O] CF (CF CH O CC (CH )=CH When a solution of 20.9 parts methacrylyl chloride and 20.3 parts triethylamine in an equal volume anhydrous ethylene glycol dimethyl ether is added to a solution of 155.7 parts in 175 parts ethylene glycol dimethyl ether, using the procedure of Part A, 110.1 parts (64.4%) of H-CaFqO 30F B.P. 86-90 C. at 0.8 mm. pressure, is obtained.

Analysis.--Ca1cd for C19H7F2906 (percent): C, 25.8; H, 0.79; F, 62.3. Found (percent): C, 25.9; H, 0.8; F, 63.0.

(F) Preparation of n'C3F10 30F CF3 The above polymers contain about 1.8% butyl acrylate and 0.5% N-methylolacrylamide, the remainder (97.7%) being n-C3F7O [CF (CF CF 0] CF(CF CH O CCR=CH EXAMPLES The polymerization procedure of Example 2 was used with the recipe below.

The 2-ethylhexyl methacrylate and fluorinated ester were added together and emulsified as described for the 1 1 fiuorinated ester in Example 2. After polymerization at 70 C. for four hours, the results shown below in Table II were obtained.

TABLE II n-CaF1O CF (CFa) CF CF(CF;) CH202CC(CH3)=CH2 (III) n-CaF1O[CF(CFa) CFgOIaCF(0F3)CH202CC(CE1)=CH2 See Example 2.

The above polymers contained 0.5% 2-hydroxyethyl methacrylate, 0.4% N-methylolacrylamide, 24.9% 2-ethylhexyl methacrylate and 74.2%

n-C F O [CF (CF CF 0] CF( CF CH O CCR=CH EXAMPLE 4 A mixture of 2140 ml. water, 106 ml. dimethyloctadecylamine and 64 ml. acetic acid was stirred until solution was complete. It was then added to 2310 ml. water, followed by 1000 g. of

shown below in Table III.

TABLE HI 12 Approximately a polymer containing 97.7% 2- ethylhexyl methacrylate, 1.8% N-methylolacrylamide and 0.5% ethylene dimethacrylate was obtained.

Inherent viscosity Percent solids 0.76 at 0.5%. 0.78-0.84 at 0.5%.

EXAMPLE 6 The various aqueous emulsions of the polymers of Examples 2, 3 and 4 were combined with the emulsions of Example 5, Parts A and B to form emulsions wherein the total solids contained by weight of in polymerized form. The resulting emulsions were then diluted to 13.5% solids content. The following combinations were prepared:

Percent Inherent solids viscosity Monomer (I) n-CsF7OCF(CFs)CF2OCF(CF3)CH OzCG(CH )=CH 23.5 1.9 at 0.5%. (II) n-CaF1OCF(CFa)CH2OzOO(CH3)=CHz (III) 11-CaF7O[CF(CF3)CF O];CF(CFa)CHgO CCH=OH 13.0 1.02-1.06 at 0.5%. (IV) n-CaF1OiCF(CFs)CFzOlzCF(CFs)CHzOzGC(CH3)=OH 22.8 1.1at0.5%.

' See Example 2 EXAMPLE 5 Combi- Copolymer of this invention employed Polymer of Iliiition P01 1' of exam le No Exalilpleds e e (A) An aqueous emulsion was run at 70 C. for four o m p mp hours, using the following recipe added in the order shown; 2 gg f ff f i l fiff h g the general procedure was analogous to that of Examples "IIIIdoLZIII.- -.-.I-.-----. ----I- .I-I. III A 3 and 4. j: i III B Parts iv 2 Demineralized water 2200 H A Octadecylidmethylamine 20 III Acetic acid 12.2 H B 2-ethylhexyl methacrylate 1000 o..- III B Acetone 237 15 .f..?iii?f'ffif .??iifi -3: h i Sodium chloride 0.7 is gg g} i N-methylolacrylamide (as 60% solution) 18 Azobis(isobutyramidine)dihydrochloride 0.222 EXAMPLE 7 Approximately a 30% polymer containing 98% 2-ethylhexyl methacrylate and 2% N-methylolacrylamide was obtained.

(B) The polmerization of Part A was repeated at 70 C. for four hours with the following recipe added in the order shown.

Azobis (isobutyramidine) dihydrochloride 0.222

Pad baths were prepared containing the-following ingredients, based on weight of fabric (OWF) to which they were to be applied:

Component: Percent OWF Melamine Derivative a 2.0. Dispersant As indicated. Wash/wear resin 5.

MgCl 0.5. Example 6 emulsion As indicated.

Melamine derivative: 27% A.I. dispersion in water of solids, solids being 46% parafiin wax, 46% reaction product of hexamethoxy methyl melamine with three moles commercial behenic acid, 4% dimethyloetadecylamiue acetate and 4% dimethyltetradecylamine acetate.

30% Aqueous solution of the hydrochloride salt of (CH CH2O),H A condensate of a triazine with formaldehyde (Aerotex M23 Special, American Cyanamid 00.).

13 The dispersant concentrations and type of concentration of Example 7 emulsions were as follows:

Emulsion dye to increase visibility. The nature of the test solutions is shown below; Nujol, of course, is a purified petroleum oil. Anything with a rating of or greater is good or excellent; anything with a rating of 2 or over can be used only for certain purposes. As an example, if a treated fabric repels Colleen. 5 the No. 2-6 solutions, but not the No. 7 solution, its D sp n a pl fi t rating is 6. If Nujol penetrates, the rating is zero.

percent emulsion percent Bath No. OWF No. OWF

i 5 Surface 0. 035 2 1. 5 011. tension, (0. g repiellency T t 1 f dynes lcnci. 8:83 i ra ng es sou ion at 25 5 9 n-He tane 20.0 0-045 4 8... n-oci ime 21.8 0.035 5 L5 7... n-Decane -5 0. 045 5 2.5 6... n-Dodeoane. 25.0 0.035 6 1.5 5 n-Tetradecane 26.7 0-045 6 4... 50-50 hexadeeane-Nmol--. 28.7 Z 2... 25-15]hexadecane-Nujol--- 1 25 g 5 0.035 9 1.5 0.045 9 2.5 0,035 to 1.5 After the oil and water repellency ratings were detergggg g i? mined, a portion of each treated fabric sample was given 0.045 11 2.5 three standard washings and oil and water repellency 3:822 $12 ratings were again determined. A standard washing cono.o 13 1.5 sists of agitating the treated fabric for minutes at 60 M 13 C. to 100 C. in water containing 0.1% by weight of a Represents a pad bath containing a polymeric composition of this neutral chip soap+0.05% soda ash, rinsing With C. mventwnwater three times, spin drying, then pressing on each face 30 at 300 Fri-20 F. for 30 seconds. A portion of each E of these 26 baths was Padded Onto Fabllc 112 treated fabric sample was also given three standard dry (/35 Dacron polyester/ cotton poplin, tan-Thermosol cleanings and the oil and water repellency ratings were dyes, Fairforest Mills) and 407 cotton poplin (undye again determined. A standard dry cleaning consists of merceurized, neutral pH, no whiteners, 1.6 yards/ pound agitating the treated fabric for 20 minutes in tetrachloro- 46 inchfis Wide) at about 50% We p p, dried at 3 35 ethylene containing 2% commercial dry cleaning deter- F. then cured for two minutes at 340 F. gent (R. R. Street Company) and 0.5% water. The fabrics The oil and water repellencies were evaluated using the were then f' y first centflfugmg one mmute methods described below lowed by drying for five minutes in a tumble dryer at The fabric Samples were tested f water repellency 160 F. The fabrics were then pressed 15 seconds on each using A.A.T.C.C. Standard Test Method 22-1952 of the 40 a at 300 1 American Association of Textile Chemists and Colourists. The oil repellency test described above is identical to A rating of 100 denotes no water penetration or surface test method No. 118-1966T of the American Association adhesion; a rating of 90 denotes slight random sticking or of Textile Chemists and Colorists with two exceptions: wetting, and so on. (a) the same test solutions are given numbers one greater The oil-repellencytest comprises placing a drop of test 45 here than in the test method, and (b) the determinations solution carefully on the textile on a flat horizontal surare made after 3 minutes rather than the 30 seconds reface. After three minutes, any penetration or wicking into quired by the test method. The oil rating test used herein the fabric is noted visually. To aid in the observation, the is thus somewhat more severe than the oflicial test method. test solutions contained a small amount of oil-soluble blue The results are shown below.

REPELLENCIES Fabric 112 407 poplin Initial 3SW(B) 1DC(a) Initial aswoi) 1DC(a) Bath No. Oil Water Oil Water Oil Water Oil Water 011 Water Oil Water 2 so- 2 so- 3 3 so a so 4 s so- 4 so- 4 s soa 5 0 so 0 7o 0 5o 0 so 0 so 0 5o 0 so 0 7o 0 so 0 so 0 7o 0 so 0 so 0 so- 2 7o 0 so 0 7o 0 7o 0 0 so- 2 7o 0 so 0 7o 2 7o 2 so- 2 so- 2 7o 4 so- 3 7o 4 7o 4 so- 4 so- 4 7o 4 so 4 7o 4 7o 0 so- 0 7o 0 0 0 so 0 so- 0 0 0 so- 0 7o 0 0 0 so 0 5o 0 0 0 so 0 70 o o 0 so- 0 7o 0 so 0 so 0 7o 0 o 0 so 0 7o 0 5o 4 so 4 so 4 7o 4 9o 4 9o 4 5o 4 so 4 so 4 7o 5 5 7o 5 so 0 so 0 so- 0 so 0 so 0 7o 0 70 0 so 0 7o 0 7o 0 so 0 7o 0 7o 2 so- 2 so 0 7o 0 so 0 7o 0 7o 2 soa so 2 7o 2 so 2 7o 3 7o 4 so 4 so 3 7o 5 so 4 7o 4 7o 5 100 4 so 4 7o o 100 5 so 5 70 0 so- 0 70 o o 0 so 0 5o 0 o 0 so 0 7o 0 o 0 so 0 7o 0 so 0 so 0 7o- 0 5o 2 so- 0 7o 0 5o 3 sm 2 70 0 5o 0 so- 0 70 0 o Represents results obtained from a pad bath mixture containing a polymeric composition of this invention.

3,544,537 15 16 EXAMPLE 8 In Examples 7 and 8, Baths 1, 2, 3, 4, 9, 10, 15, 16, 21

Pad baths were prepared containing the following and 22 represent this invention while Baths Nos. 5, 6, 7, gredients, based on weight of fabric (OWF) to which they x 2 24, 25 and 26 represent compositions outs1de th1s mventlon.

were to be applied. Component: EXAMPLE 9 Water Repellent As indicated. Pad baths were made up having the composition shown DISPCISIOHP As mdlcated. below, based on weight of fabric (OWF) to which they Wash/wear Resm 5.0. were to be applied.

MgCl 0.5. Example 6 emulsion As indicated. fi D a gg 0W1 e amlne eriva ive I Water repellent: A- mixture of 67 parts melamine-tormaldehyde condensation product and 25 parts catalyst. The mela- Dispersal b As mdlcamd' mine-formaldehyde product istelr consists of 25% petrole Surfactant 0.03. wax and 75% reaction product of hexamethoxy methyl mela- I 1 a] h 1 2 0 mine-l-3 moles steal-1c 'acid-i-l mole triethanolamine, neu- Sopropy co o "1 tralized with acetic acid, US. Pat. 2,783,231. The catalyst con- Permanent press resin d 12.0. sisitds of 2 parts aluminum giycoiate and one part zlycolic Softenere so "1 M Same as Example 7. Example 6 emulsion As mdicated. The dispersant concentrations and type and concentra- 27% me mate Solutlon tion of Example 8 emulsions were as follows: mine as mauve Example, b Dlspe'rssnt, Example 7. I Emulsion Surfactant-013E410(CHzCHzOh-gH, 0 21121 group from 0 "on" alcohol. wfi g? Dis t E 1 6 g fi d 40% Aqueous solution of rope en persan ramp e rs on,

percent percent emulsion percent HOCHPN OH OH Bath No. OWF OWF No. OWF =0 as 2-22 1 5'? 3:3 3: 3 3g 3 a? s s rrow, a cationic fatty amide derivative (Cersmino HG- Sandoz, 8.8- 035 g $.15 8 352 4 The composition of the baths, other than as specified 2.0 0.045 4 2.5 b Q Q 8 Q 035 5 1. 5 a ve, is as foil ws 0.8 0.045 5 2.5

84 g 3 00 c 11 en- 0 3 0,035 7 1,5 Dispersant Exanal lagie 6 tration'z 0.8 0.045 7 2.5 3 Perwn m on percon 0.8 0.035 8 1.5 5 Bath No. OWF 0. OWF 0. 8 0. 045 8 2. 5 0. 8 0. 035 9 1. 5 0. 035 14 1. 6 0.8 0.045 9 2.5 0. 045 14 2.5 2.0 0.035 10 1.5 0.035 15 1.5 2. 0 0. 045 10 2. 5 0. 045 15 2, 5 0. 8 0. 035 11 1. 5 0. 035 16 1. 5 0. 8 0. 045 11 2. 5 0. 045 16 2. 5 0. 8 0. 035 12 1. 5 035 17 1. 5 g, g 1&5 %g 0.045 v 17 2. 5

0. 5 0,3 045 13 2, invgllilttcigflesents pad baths containing a polymeric composition of this Represents a pad bath containing a polymeric composition of this invention These baths are primarily for use in obtaining the so- E h f th s 26 b th was padded on Fab ic 112 and called permanent press garments. Samples of Fabric 112 407 cotton poplin (both described in Example 7) at about and 407 cotton poplin (described in Example 7) were wet pickup, dried at 340 F. and cured for two mintreated with the baths to obtain about 50% wet pickup, utes at 340 F. Repellencies were determined initially, air dried and cured at 350 F. for 15 minutes. In addiafter three washings and one dry cleaning with the retion to evaluation initially and after three standard suits shown below. washings (35L) the samples were also evaluated in the Fabric 112 407 Poplin Fabric Initial ssw m0 Initial asw 1130 Bath No. Oil Water Oil Water 011 Water Oil Water Oil Water Oil Water 3 so 2 so 3 7o 2 so- 2 so- 3 7o 4 so 4 so 4 7o 4 so 4 so 4 7o 4 so 4 so- 4 7o 5 so 4 so- 7 7o 0 so 0 so 0 50 0 so- 0 7o 0 5o 0 so 0 so 0 10 0 so- 0 0 so 0 so 0 so 0 7o 0 70 0 so- 2 7o 0 so 0 so- 2 1o 0 so 2 so- 3 7o 2 so 0 so 2 70 s so 3 1o 4 70 s so 2 so 5 7o 4 so 4 so 5 7o 0 so 0 so 0 70 0 so 0 7o 0 o 0 so 0 so 0 7o 0 so o 70 0 5o 0 so 0 7o 0 so 0 so o 70 o 70 0 so 0 70 0 1o 2 so 0 so- 2 7o 4 so 4 so 2 7o 4 so 4 so 3 7o 4 so 5 so 4 7o 5 so 4 so- 4 so 0 so 0 so 0 70 0 so- 0 70 o 50 0 so 0 so 0 7o 0 so- 0 7o 0 7o 0 so 0 so 0 7o 0 7o 0 7o 2 7o 2 so 3 so- 2 7o 2 7o 2 1o 3 7o 2 so 2 so- 2 7o 4 so 3 so- 2 7o 4 so 4 so 4 7o 4 so 4 so- 4 1o 0 so 0 so 0 5o 0 so- 0 70 o 50 0 so 0 so 0 7o 0 so- 0 7o 0 50 0 so 0 so 0 1o 2 so 0 10 o 70 3 so- 3 so 2 7o 3 so 2 70 3 7o lttepresents results obtained from a pad bath mixture containing ajpolymcric composition or this in; you run.

1 9 EXAMPLE '12 A solution of 19.1 parts n-C F OCF ('CF CF CF (CF CH OH in 50 parts ethylene glycol dimethyl ether was added slowly at 5 C. to 1.62 parts potassium metal under a nitrogen atmosphere. After addition was complete, the mixture was carefully warmed to 60-70" C. and main tained for 2.5 hours. Then 4.39 parts methacryloyl chlo ride in 50 parts ethylene glycol dimethyl ether was added slowly over a 4-hour period. After agitating overnight, 15 parts isopropanol were added to decompose any unreacted potassium.

EXAMPLE 13 A solution of 132.2 parts n-C F O [CF (CF CF 0] CF (CF CH OH EXAMPLE 14 A mixture containing 11 parts water, 0.187 part dimethyloctadecylamine, 0.09 part acetic acid, 5 parts acetone and 388 parts of the ester of Example 13 was purged with nitrogen while held at 70 C. for 1.5 hours. After coolingto 60 C., 0.112 partn-butyl methacrylate, 0.08 part N-methylolacrylamide and 0.002 part azobis(isobutyramidine dihydrochloride) were added. The mixture was agitated for four hours at 60 C. The resulting latex contained 13.5% polymer solids.

A pad bath was prepared containing 4.0% on weight of fabric of the above polymer latex. This was applied to fabric and cured as described in Example 7. The oil 20 and water repellency were evaluated using the tests of Example 7: oil repellency 6, water repellency 50.

The preceding representative examples may be varied within the scope of the present total specification disclosure, as understood and practiced by one skilled in the art, to achieve essentially the same results.

The foregoing detailed description has been given for clearness of understanding only and no unnecesary limitations are to be understood therefrom. The invention is not limited to the exact details shown and described, for obvious modifications will occur to those skilled in the art.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. An ester having the structural formula References Cited UNITED STATES PATENTS 2,811,501 10/1957 Stedry 26089.5H 2,826,564 3/1958 Bovey et al 260486H 2,839,513 6/1958 Ahlbrecht et a1. 260486H 3,201,445 8/1965 Drysdale et al 260461 3,385,882 5/1968 Tullio 260485 HARRY WONG, JR., Primary Examiner US. Cl. X.R. 

